eidson



2 Sheets-Sheet 1.

(No Model.)

H. EIDSON 82; A. LEMON.

LOCK.

d Mar. 29, 1898;

N erenff zdsonand R moraumo WASHINEJON. 04 c.

(No Model.) 2 Sheets-Shed 2.

H.- EIDSON- 8a A. LEMON. LOCK.

3 UNITED STATES PATENT LOCK.

SPECIFICATION forming part of Letters Patent No. 601,337, dated March 29, 1898.

7 Application filed May 17, 1897. Serial No. 636,966. (No model.)

To all whom it may concern:

Be it known that we, HERBERT EIDSON and ALBERT LEMON, citizens of the United States, residing at Berrien Springs, in the county of Berrien and State of Michigan, have invented certain new and useful Improvements in Reversible Rim and Mortise Looks; and we do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which i of the invention.

.proved lock with the side plate removed.

. bolt.

Figure 1 is a perspective view of our im- Fig. 2 is a similarview with the guard adj usted to prevent the key being inserted from the outside of the door. Fig. 3 is a side eletion showing the bolt shot. Fig. 4 is a longitudinal section through the center of the Fig. 5 is a horizontal section through the bolt. Fig. 6 is a longitudinal section through the key, and Fig. 7 is a similar view of the safety-key.

1 represents the rectangular lock-case, comprising the back plate 2, the face plate 3, the top flange 4, bottom flange 5, and the rear flange 6, all of which are cast or formed integral with the back plate.

7 represents the reversible latch, provided with the horizontal shank 8, terminating in the vertical plate 9, arranged at a right angle to said shank.

10 represents a leaf-spring fixed tothe case and having its free end engaging the shoulder 11 of the latch to normally project it forward.

12 represents a bell-crank lever fulcrumed on a stud 13 on the back plate 2, its vertical arm 14 extending in front of the plate 9 on the flange 5.

the knob-socket 17. This socket is provided with oppositely-disposed radial lugs 18 18, which engage the contiguous face of the bellcrank lever on each side of the socket, so as to depress the outer end of the arm 15, and by means of the vertical arm 14 withdraws the latch into the case when said socket is turned to the right or left by appropriate knobs fixed on a square spindle extending through the corresponding orifice 19 in the socket.

20 represents the lock-bolt, which has a horizontal reciprocating movement between the fixed guide-studs 21 22.

23 23 represent lateral pins extending across and projecting on each side of said bolt which alternately engage the retainingnotches 24 25 in the parallel tumblers 26 27, fulcrumed at their rear ends on a common stud 28.

29 29 represent independent leaf-springs fixed in the case and having their free ends resting upon the upper edges of said tumblers, so as to hold the retaining-notches 24 or 25 in said tumblers in engagement with the pins 23 23 on the bolt at all times, .except when said tumblers are raised by the key to release the bolt.

30 represents a pocket or recess formed in the lower edge of the bolt, and it is provided with converging ends 31 31 and parallel walls 32 32.

33 represents a guard-plate sliding freely between the guide-studs 21 21 and the bottom This plate 33 is formed with a rightangular end flange 34, which carries a fixed nut 35, which receives a threaded stud 36, the projecting outer end of which terminates in a cross-bar 37, arranged to rotate in a cylindrical recess 38, formed in the face-plate 3,

and as the threaded stud 36 is rotated by its the solid portion of said guard-plate covers the keyhole and prevents theinsertion of the key from the out or opposite side of the look.

When the keyhole in the lock is covered by the guard-plate, a lug or stud 41 on said guardplate is brought into alinement with the keyhole in the rear plate of the lock. (Not shown.)

42 represents the key proper, and its shank 43 is provided with two lugs 44 44, which may be inserted in the recess 38 in the face-plate 3 to engage the cross-bar 37 and conveniently manipulate the guard-plate.

45 represents a cylindrical stud or plunger mounted in the barrel 46, its inner end engaging a spiral spring 47, which normally projects the end of the plunger beyond the end of the barrel, as shown.

- sertion.

When the lock is in ordinary use, the key-orifice in the guardplate isadjusted in line with the keyhole and the key used to open and close the lock in the usual manner.

When it is desired to shoot the bolt from the outside of the door and still render it comparatively safe against the insertion of ordinary keys and picks, a safety-key 48 is inserted in the look from the inside of the door and secured in place. This safety-key 48 comprises a cylindrical shank 49, on which is mounted a barrel 50, which incloses a spiral spring 51, encompassing the shank, and which normally retains the end of the shank flush with the end of the barrel and at the same time permits the shank to be extended through the end of the barrel when desired. This barrel 50 revolves freely on the shank 49, and it is provided near its outer end with an annular flange 52 to limit the insertion of the barrel in the keyhole, and when so inserted a radial lug 53 on the barrel extends into the keyhole-slot and prevents the rotation of the barrel in the look. A radial pin 54 on the end of the shank extends into a longitudinal slot 55 in the outer end of the barrel, and when the barrel is inserted the shank is pressed inwardly to release the the pin from the slot in the barrel and then turned to the right or the left, so that when released the radial pin will be drawn against the inner face of the lockplate to secure the safety-key in place,

When the safety-key is in place, as above described, its shank projects into the path of an ordinary key and forms a barrier to its in- If, however, the key 42 is inserted from the opposite side of the lock, its plunger 45 comes in contact with the projecting end of the shank of the safety-key, which forces said plunger into the barrel 46, so that the end of the barrel projects over the end of the shank of the safety-key and forms a guidepivot for the key 42 to turn upon and operate the bolt. If, on the other hand, the guardplate is drawn to. close the outside keyhole and the key 42 inserted from the inside, the end of the plunger comes in contact with the alined stud 41 on the guard-plate, causing the plunger to recede into its barrel and permitting the end of the barrel to'encompass the stud and rotate thereon to operate the bolt.

In Fig. 2 we have shown the plate 33, provided with a second alined nut 35, so that the plate may be reversed when desired. By this arrangement when the latch 7 is reversed the guard-plate 33 is also reversed to throw the guard on the opposite side of the lock and thereby protect the exposed keyhole. In this manner the lock is made reversible either as a rim or mortise lock, and by reversing the latch 7 to correspond the lock proper can be made right or left hand at will, so as to lit to either side of a door or to the same side of a door opening to the right or left.

Although we have specifically described the construction and relative arrangement of the several elements of our invention, we do not desire to be confined to the same, as such changes or modifications may be made as clearly fall within the scope of our invention without departing from the spirit thereof.

Having thus fully described our invention, what we claim as new and useful, and desire to secure by Letters Patent of the United States, is

1. A look comprising the face-plate 3, pro- I vided with the recess 38, and the back plate 2 provided with the keyhole 40, in combination with the threaded stud 36 provided with the cross-bar 37 mounted in said recess 38, and the reversible sliding guard-plate 33 provided with the keyhole 39, the angular end flanges and the threaded nuts 35 35 either one of which is adapted to receive the stud 36, substantially as and for the purpose set forth.

2. A look of the class described, comprisin g a sliding guard-plate, in combination with a safety-key adapted to be removably secured in said look, but incapable of operating the same, and an operating-key as 42, provided with a spring-actuated plunger 45, the end of which projects beyond the barrel of said key, substantially as shown and described.

In testimony whereof we hereunto affix our signatures in presence of two witnesses.

HERBERT EIDSON. ALBERT LEMON.

Witnesses: I

Gno. EIDSON, W1vr. H. SYLVESTER. 

